Tomato scheduler, run every 30 seconds?

I want a task in tomato scheduler to run every 30 seconds but the box to input numbers is labeled as "minutes" and won't accept .5 or anything like that. Is it possible to modify the scheduler file, or perhaps execute a task every 30 seconds some other way?

Please read how cron works. The smallest intwrval is 1 minute. As jeerm said, you can write bash script which will do something sleep 30 seconds and do it once again. Then this script add to cron with one minut interval